Servlet如何得到服务器的信息？
Servlet可以使用如下四种方法来得到server的name, port和info
如下代码实现用servlet取得server的信息并输出到客户端浏览器：
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public?class DemoServerSnoop extends GenericServlet{
public void service(ServletRequest?req?,?ServletResponse?res)
throws ServletException,IOException{
res.setContentType("text/plain");
PrintWriter?out=?res.getWriter();
out.println("req.getServerName()" +?req.getServerName());
out.println("req.getServerPort()" +?req.getServerPort());
out.println("ServletContext().getServerInfo()" +
getServletContext().getServerInfo());
out.println("getServerInfo()?name:" +
getServerInfoName(getServletContext().getServerInfo()));
out.println("getServerInfo()?version:" +
getServerInfoVersion(getServletContext().getServerInfo()));
out.println("getServerContext().getAttribute("attribute")" +
getServletContext().getAttribute("attribute"));
}
private String?getServerInfoName(String?serverInfo){
int slash?=?serverInfo.indexOf('/');
if(slash==-1)
return serverInfo;
else
return (String) serverInfo.subSequence(0,slash);
}
private String?getServerInfoVersion(String?serverInfo){
int slash?=?serverInfo.indexOf('/');
if(slash==-1)
return?null;
else
return serverInfo.substring(slash?+ 1);
}}
